Compass International Co., Ltd China
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Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
Sadiatec
Sadia Intertec is committed to serve the foreign people living in Japan to have the opportunity to talk with their families, relatives and also for business purpose with economic rate. We are dedicated to our customer so that they can enjoy the calling wi
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